287961 has 4 divisors (see below), whose sum is σ = 383952. Its totient is φ = 191972.

The previous prime is 287939. The next prime is 287977. The reversal of 287961 is 169782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 287961 - 2⁹ = 287449 is a prime.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (287921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47991 + ... + 47996.

It is an arithmetic number, because the mean of its divisors is an integer number (95988).

2²⁸⁷⁹⁶¹ is an apocalyptic number.

It is an amenable number.

287961 is a deficient number, since it is larger than the sum of its proper divisors (95991).

287961 is an equidigital number, since it uses as much as digits as its factorization.

287961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95990.

The product of its digits is 6048, while the sum is 33.

The square root of 287961 is about 536.6199772651. The cubic root of 287961 is about 66.0355639368.

The spelling of 287961 in words is "two hundred eighty-seven thousand, nine hundred sixty-one".